Sandpapering-machine



J. SIAKEL.

SANDPAPERING MACHINE. APPLICATION FILED 0cT.26, ma.

Patented Feb. 17, 1920.

4 SHEES-SHEET l.

J. SIAKEL.

SANDPAPERING MACHINE'.

' APPLICATION FILED OUI-.26| 1918- v 1,330,959. Patented Feb. 117, 1920.

4 SHEETS-SHEET 2.

TA/VENTO@ Qin/@QQ Pateuted Feb. 17,1920.

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' Aybrwey,

UNITED STATES PATENT OFFICE.

JOHN sIAKEL, or CHICAGO, ILLINOIS.

SANDPAPERING-MACHINE.

Application filed October 26, 1918.

To all whom t may concern.'

Be it known that I, JOHN Brunn., a subject of the Emperor ofAustria-Hungary, residing in the city of Chicago, in the county of Cookand State of Illinois, have invented new and useful Improvements inSandpapering-Machines, of which the following is a specification.

This invention relates to power driven sand-papering machines arrangedto sand-y paper the edge of a single board or a plurality of boards andhas among its objects to provide a novel machine of this character whichshall be eXible and efficient in operation, and wherein the slidablymovable work table will be simultaneously moved in oppo-i site directionto the movement lof the revolving sand-papering rolls.

Vith these and other objects in view my invention consists in the novelconstruction,

combination, and relative position oftheparts and members shown intheaccompanying drawings, hereinafter described, and particularlypointed out in the appended claims.

Referring to the drawing in whichl like;

reference characters indicate like or corresponding parts: y

Figure 1 is a plan view of my preferred form or construction embodyingmy invention. Fig. 2 is a sectional elevation taken online 2 2 of Fig. 1showing the revolving traveling sand-papering rolls. Fig. 3 is a crosssection taken on line 3-3 of Fig. 1 showing the relative position of thesandpapering rolls and work table.

Fig. 1, is an end elevation taken on line l--t of Fig. 1.

Referring to the drawings, which show one embodiment of my invention, Iprovide the stationary table 10 which is equipped with longitudinaltracks 11 upon which is slidably mounted for reciprocating movement thework-supporting frame 12. The driving mechanism for the frame 12includes the threaded drive shaft 13 which is located below the frame 12and which eX- tends longitudinally ofthe table 10 with the ends thereofsupported in bearings 14 and 15A. The frame 12 has operative connectionwith shaft 13 by means of the threaded sleeve 16 which is rigidlymounted to the bottom of the frame.

At one end of the shaft 13 I provide a Specicaton of Letters Patent.

pairof loosely mounted bevel gears 17 and 18 arranged for alternateoperative engagement by the jaw clutch 19 whereby said shaft 13 receivesalternate reverse movements from the driving bevel gear 20 which isrigidly mounted upon the end of shaft 21, which shaft 2l is propelled bya belt drive including a belt 22 passing over pulleys 23 and 24; thepulley 21 being provided with a friction clutch 25 so as to providemeans for disconnectingthe reciprocating frame driving machinery whenthe frame 12 is maintained in stationary position. The pulley 23 isrigidly mounted on the main drive shaft 26, which is propelled by thepulley 28 and belt 27 leading from any desirable source of power.

The clutchoperating lever 29, pivoted at 30 upon one side of thesubstantially square casting 15 which supports the ends of shafts 13 and21, is formed with an arcuate rack 29A having teeth in'mesh with thepinion 31, the opposite side of which pinion is engaged by t-he teeth ofthe rack 32 formed at one end of the rod `33 which is slidably mountedin bearings '34 supported on one side of the table 10. The frame 12carries a rigid arm 35 through which the rod 33 passes and which arm 35is arranged to engage either one of the lugs 36 rigidly mounted on rod33. It is obvious that the longitudinal adjustment of the lugs 36 uponrod 33, controls the length of travel of the frame 12. In engagingeither of the lugs 36, the rod 33 will shift'the rack 32 and thus causea rotation of pinion 31 and a movement of the underlying rack 29A andthus shift the clutch operating lever 29 so as to disengage the clutch19 from either one of the gears 17 or 18. At this point of theoperation, the movement of the frame 12 is stopped and would remain instationary position were it not for the weighted arm 37, (which isrigidly mounted on the end of shaft 38 which supports the pinion 31),which having passed a dead center, continues to move the shaft 38 bygravity, whereby the pinion 31 will cause a further movement of the rack29A and lever 29 so as to engage the clutch 19 with one of the gears 17or 18 and thus continue the movement of the frame 12 in the oppositedirection.

To facilitate the retaining of boards of varying width upon the frame12, I provide table 10, ig a 'base 42 having guides 43 within which isslidably mounted the abrasive roll-supporting frame 44. This frame 44supports the two `abrasive rolls 40, the adjacent shifting rolls 45, andthe idler rolls 46. The two abrasive rolls 40 are rigidly mounted uponspindles 40A, the upper ends of which have slidable support within thetop of the frame 44, and the lower ends of which carry the rigidlymounted pulleys 47. The intermediate shifting roll 45 carries thecomparatively smaller pulley 48 at the end of its spindle 49, but inthis case the pulley 48 is loosely mounted and acts only as an idlerpulley for the drive belt 50 which eX- tends from the end pulley 51 tothe drive pulley 52. Fig. 1 shows the arrangement of the belt drive 50,wherein the idler pulley 48 intercepts the belt so as to deflect itaround same and thus aford arcuate contact with the two pulleys 47.

The two end shifting rolls 45 are provided with spindles 53, the lowerends of which and also that of spindle 49, carry the chain sprockets 54,55, and 56. A continuous chain 57 passes from the sprocket 54 tosprocket 56 and consequently is also engaged by the center sprocket 55.Below the sprocket 56 and also rigidly mounted to the spindle 53 isanother sprocket 57 which is operatively connected by a chain drive 58to the smaller sprocket 59 mounted on spindle' 40A, which sprocket 59 isoperatively connected to said spindle 40A by means of an extended key40B and is also rigidly connected to the adjacent pulley 47. The pulleys47 are supported upon brackets 60, and one of the spindles 40a having acollar 61 below the bracket 60 to prevent vertical movement of pulleys47.

The spindles 49 and 53 are supported in substantially square blocks 62which are yieldingly mounted in frame 44 against springs 63 retained bythe cover plates 64.

The idler rolls 46 are loosely mounted on short spindles in asubstantially rectangular frame 65 which is slidable in guides 44A inthe end horizontal cross members 44B of the frame 44 responsive to thesimultaneous rotation of the four screws 66 which have threadedcoimection through the four corners of the frame 65 and are looselymounted in the frame 44.

The mechanism for simultaneous rotation of the screws 66 wherebysaidframe 65 is moved toward or from the abrasive rolls 40 includes amiter gear 67 on one end of each screw 66 in mesh with a miter pinion 68mounted on a shaft 69 the other end of which carries a similar miterpinion 68 which also meshes with a miter gear 67 on the coperative screw66 at the other end of the frame. The upper and lower sets of screws 66being interconnected by the miter gears 70 upon the vertical shaft 71which is provided with the operating hand crank 72.

In addition to the operation of the abrasive rolls 40 on work upon theframe 12, a stick of timber can be simultaneously sandpapered on theopposite side of the rolls 40 by insertion between the idler rolls 46and the shifting rolls 45, which shifting rolls will gradually move suchtimber at a reduced speed due to the reduction in drive 58. In thesand-papering 0fsuch timber, as for instance shown dotted and marked Xin Fig. 3, it is desirable to first insert a timber Y of any suitablesmaller cross section to act as a support, then upon the rotation ofcrank 72 simultaneously move the three idler or presser rolls 46 toward.the yieldingly mounted shifting rolls 45, and with the timber Xtherebetween, until the face of timber X engages the abrasive rolls 40.It is now obvious that the pressure of springs 63 and rotary movementrolls 45,is suflicient to overcome the dead weight of the timber X andmove the same past the abrasive rolls 40.

The reciprocatory motion of the frame 44 in guides 43 of the base 42 isprovided by a the driving mechanism for the frame 12, and includes alongitudinally extending threaded drive shaft 7 3 supported at one endin bearing 74 and at the other end in the cast gear support 75 at whichpoint the shaft is also provided with spaced loosely mounted gears 76and 77. These gears 76 and 77 are arranged for alternate engagement bythe clutch 78 which is operated by the operating lever 79 pivoted at 80and carrying an arc uate rack 81 at the outer end where pinion 82 isengaged thereby. The pinion 82 mounted on shaft 89 and is adapted foroperation by the rack 83 formed at the end of bar 84, which bar 84carries adjustable rigidly mounted lugs 85 arranged for alternateengagement by the arm 86 rigid on the Y frame 44. The shaft 89 isprovided with a weight arm 90 similar to arm 37. It is obvious that theframe 44 will receive a reciprocating movement through the describedautomatic reversing mechanism the operation of which is similar to thatabove described for the frame 12 and which in this case is driven by thegear 87 at one end of the shaft 21.

The arrangement of the machinery is such that the frame 12 always movesin opposite direction to the frame .44, and that by dis- 100 mechanismsimilar to and eoperating with; Y

frame 92 and operatively connected to the.

main drive shaft 26 by bevel gears 98 and 94.

In order to impart a slight vertical movement to the rolls 40,simultaneously with their rotation upon the spindles 40a I provide amechanism Which consists of an oscillating arm 95 Which is pivoted at 96and which has forked ends 95A arranged to embrace the collars 97 looselymounted on the spindles 40A under the collars 98 which are rigidly fixedthereon. A link 99 connects one end of the oscillating arm 95 with thepin 100 on bevel gear 101 and which pin is arranged eccentric to spindle102 Which is held in bracket 108. The bevel gear 101 receives itsmotion' from the' bevel gear 104 operatively mounted on spindle 40A.Thus by the operation of belt 50, pulleys 47, the spindles 46 Will berevolved and simultaneously, through the bevel gears 104 and 101,

and link 99, the oscillating arm 95 Will transmit an alternate verticalmovement to the abrasive rolls 40 which are rigid upon spindles 46.

It is thought that the foregoing description and illustrations clearlydisclose the construction and operation of the invention, hence a moreextended explanation I,is omitted.

I claim:

1. In a sand-papering machine, the combination of a pair of parallelrotary perpendicularly reciprocating sand-papering rolls, guides, amovable support for said rolls mounted on said guides, means forreciprocating said support, a reciprocating Work-supporting framearranged for movement opposite in direction to said rolls, and means forarresting the movement of said roll support.

2. In a sand-papering machine, the combination of a pair of parallelrotary perpendicularly reciprocating sand-papering rolls, guides, amovable support for said rolls mounted on said guides, means forreciprocating said support, a reciprocating Work-supporting framearranged for movenient opposite in direction to said rolls, and meansfor arresting the movement of said roll support or said frame.

In Witness whereof, I have hereunto subscribed my -name this 19th day ofOctober, 1918.

JOHN SIAKEL.

